TS650 Buck Switching Regulator Pin assignment: 1. Out 2. P.Gnd 3. CT 4. Gnd 5. FB 6. Vcc 7. Comp. 8. Enable Supply Voltage Range 3 V to 30V Output Driving Current 500mA Oscillator Frequency up to 100KHz General Description The TS650 is a monolithic buck switching regulator, it is consist of an voltage reference, error amplifier, current limited set by an external resistor, power forward modular controller and switching frequencies up to 100KHz are set by an external capacitor. Additionally, a chip enable feature is provided to power down reducing the supply current, and with a minimum number of external components, the TS650 offer a simple and cost effective solution. The TS650 is offered in SOP-8 package. Features Pin Descriptions Power forward control circuit Name Operating voltage form 3V to 30V Output PWM Output Low standby current Current limit adjustable P.Gnd CT Power Ground Oscillator Control Output switch current up to 500mA Gnd Ground Variable oscillator frequency up to 100KHz (max) Shut down control FB Vcc Voltage Feedback Power Supply 1.25V voltage reference Output Applications Charger xD-ROM, xDSL product DC to DC converter s Description Comp. Feedback Compensation Enable ON/OFF control Ordering Information Part No. TS650CS Operating Temp. o -20 ~ +85 C Block Diagram TS650 1-4 2003/12 rev. A Package SOP-8 Absolute Maximum Rating Supply Voltage VCC 30 V Comparator Input Voltage Range VFB - 0.3 ~ 30 V Collector Output Voltage VC(SW) 30 V Collector to Emitter Voltage VCE(SW) 30 V Output Switching Current ISW 500 mA Operating Junction Temperature Range TJ -20 ~ +125 o C -65 ~ +150 o C 260 o C Storage Temperature Range TSTG Lead Temperature 1.6mm(1/16”) from case for 10Sec. TLEAD Electrical Characteristics o (VCC =5V, Ta =25 C; unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Unit Reference 1.25 1.27 V Ta= -20 C ~ 25 C 1.23 - 0.1 1 % Ta= 25 oC ~ 85 oC - 0.2 1 Comp. Connect to FB Output voltage change with VREF temperature Line regulation o o 5 mV 1.2 V RegLine VCC = 5V ~ 30V VCE(SAT) ISW =0.5A 1.0 ISW =1A, Vce=0.5V 75 IC(OFF) Vce=30V 40 100 uA FOSC CT = 1nF, Vpin5=0V 33 42 KHz Output switch (note1) Saturation Voltage DC current gain Collector off-state current HFE -- Oscillator (OSC) Frequency Charge Current ICHARGE 24 VCC = 5V ~ 30V 35 uA Discharge Current IDISCHARGE VCC = 5V ~ 30V 220 uA Discharge to Charge current ratio IDISCHARGE Pin7 to Vcc 6.5 -- / ICHARGE Current Limit Sense Voltage VIPK(SENSE) IDISCHARGE = ICHARGE 250 350 mV 4 5 V 1 V 100 mA 5 mA ON/OFF driver control ON driver voltage Von OFF driver voltage Voff ON driver current Ion VCC = 3V ~ 30V Total device supply current ICC VCC = 5V ~ 30V, CT = 1nF, 3 pin7=Vcc, pin5>Vth, pin2=Gnd, remaining pins open -400 Input bias current IIB Vin=0V Note 1: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature. TS650 2-4 2003/12 rev. A nA Typical Application Circuit Device Value Device Value R1 5.6K, 1/8W C1 470pF, 16V R2 1K,1/8W C2 470uF, 16V R3 100ohm, 1/4W L1 180uH, 2A R4 100ohm, 1/4W D1 SK34A R5 0.33ohm, 1W Q1 TSB1386CY R6 300ohm, 1/2W R7 300ohm, 1/2W Remark: * Output = 1.25V * (R1/R2 +1) = 1.25V * (5.6K/1K + 1) = 8.25V @ 3A * SK34A: Taiwan semiconductor, Schottky 3A/40V in SMA package * TSB1386CY: Taiwan semiconductor, PNP transistor 5A/20V in SOT-89 package TS650 3-4 2003/12 rev. A SOP-8 Mechanical Drawing A SOP-8 DIMENSION DIM 9 16 B 1 P 8 G R C D TS650 M F MILLIMETERS INCHES A MIN 4.80 MAX 5.00 MIN 0.189 MAX 0.196 B 3.80 4.00 0.150 0.157 C D 1.35 0.35 1.75 0.49 0.054 0.014 0.068 0.019 F 0.40 1.25 0.016 0.049 G K 1.27 (typ) 0.10 0.25 0.05 (typ) 0.004 0.009 M 0o 7o 0o 7o P R 5.80 0.25 6.20 0.50 0.229 0.010 0.244 0.019 K 4-4 2003/12 rev. A